Table 1

The fluorescence substances of different Ex/Em regions

RegionEx/Emfluorescence substances
I 200–250/300–330 Aromatic protein I (Tyronsine) 
II 200–250/330–380 Aromatic protein II (Tryptophan) 
III 200–250/380–500 Fulvic acid-like 
IV 250–400/300–380 Soluble microbial by-product-like (Protein-like containing tryptophan, tryptophan and protein-like related to biological) 
V 250–400/380–500 Humic acid-like 
RegionEx/Emfluorescence substances
I 200–250/300–330 Aromatic protein I (Tyronsine) 
II 200–250/330–380 Aromatic protein II (Tryptophan) 
III 200–250/380–500 Fulvic acid-like 
IV 250–400/300–380 Soluble microbial by-product-like (Protein-like containing tryptophan, tryptophan and protein-like related to biological) 
V 250–400/380–500 Humic acid-like 
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